一种图像置乱算法及在数字电视中的应用研究  

Image Scrambling Algorithm and Its Application in Digital TV

作　　者：崔基哲[1] 张波[1,2] Jong Weon KIM 

机构地区：[1]延边大学经济管理学院信息管理与信息系统,吉林延吉133002 [2]韩国祥明大学,著作权保护专业韩国首尔110743

出　　处：《电视技术》2011年第20期24-27,共4页Video Engineering

基　　金：2009年度MCST&韩国著作权委员会技术开发项目

摘　　要：阐述了数字电视加解密原理,并介绍了图像置乱算法及其在数字电视行业中的应用。中国的数字电视行业已经迈入高清时代,但收费节目的管理、卫星传播与有线传播的协调等问题上,还需要成熟的解决方案。提出了基于离散余弦变换的图像置乱算法,可适用于收费电视节目的安全管理。通过本算法可以简化原数字电视加解密系统的两端间的交互流程,增加CA共享所带来的安全性。经测试发现,提出的图像置乱算法抑制了其他置乱算法中存在的块效应,算法基本满足数字电视的管理及播放要求,无须增加硬件费用。In this paper, the theory of encryption and decryption about digital television is elaborated, then the image scrambling algorithm and the application in digital television industry are introduced. In China, the digital TV has stepped into the high definition age, while there also need the mature solution in the management of fee programmers, as well as the balance of satellite transmission and cable transmission. An image scrambling algorithm based on the Discrete Cosine Transform （DCT） is put forward It can be used in managing the security of fee - TV programmers. By means of this algo- rithm, it can simplify the interactive process between original digital TV encryption and deeryption, and increase the security bringing by CA share. By test, it is founded that the image scrambling algorithm promoted in this paper restrains blocking effects existing in other scrambling algorithm. The algorithm can content the demand of managing and playing of digital TV, dispense with increasing the hardware costs.

关 键 词：图像加密 置乱算法 数字电视 条件接收系统 离散余弦变换 

分 类 号：TN05[电子电信—物理电子学] TN949.197